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Add a 'fine adjustment' mode to ranges

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Shift-click in the slider now starts a drag in 'fine adjustment'
mode, where we move the slider 10-times slower than the mouse.

This can be very helpful when scrolling through a very long document
or webpage, and moving the scrollbar even a single pixel already
jumps too far in the content.

https://bugzilla.gnome.org/show_bug.cgi?id=563688
This commit is contained in:
Matthias Clasen 2012-04-26 17:51:13 -04:00
parent 162614aab4
commit 22eb687264
1 changed files with 34 additions and 8 deletions
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34
gtk/gtkrange.c
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@ -138,6 +138,9 @@ struct _GtkRangePrivate
/* The range has an origin, should be drawn differently. Used by GtkScale */
guint has_origin : 1;
/* Whether we're doing fine adjustment */
guint zoom : 1;
/* Fill level */
guint show_fill_level : 1;
guint restrict_to_fill_level : 1;
@ -2367,6 +2370,8 @@ range_grab_remove (GtkRange *range)
if (gtk_range_update_mouse_location (range) ||
location != MOUSE_OUTSIDE)
gtk_widget_queue_draw (GTK_WIDGET (range));
priv->zoom = FALSE;
}
static GtkScrollType
@ -2433,7 +2438,7 @@ range_get_scroll_for_grab (GtkRange *range)
static gdouble
coord_to_value (GtkRange *range,
gint coord)
gdouble coord)
{
GtkRangePrivate *priv = range->priv;
gdouble frac;
@ -2635,6 +2640,12 @@ gtk_range_button_press (GtkWidget *widget,
*/
need_value_update = TRUE;
}
else
{
/* Shift-click in the slider = fine adjustment */
if (event->state & GDK_SHIFT_MASK)
priv->zoom = TRUE;
}
if (priv->orientation == GTK_ORIENTATION_VERTICAL)
{
@ -2667,13 +2678,14 @@ update_slider_position (GtkRange *range,
gint mouse_y)
{
GtkRangePrivate *priv = range->priv;
gint delta;
gint c;
gdouble delta;
gdouble c;
gdouble new_value;
gboolean handled;
gdouble next_value;
gdouble mark_value;
gdouble mark_delta;
gdouble zoom;
gint i;
if (priv->orientation == GTK_ORIENTATION_VERTICAL)
@ -2681,7 +2693,21 @@ update_slider_position (GtkRange *range,
else
delta = mouse_x - priv->slide_initial_coordinate;
c = priv->slide_initial_slider_position + delta;
if (priv->zoom)
{
zoom = MIN(1.0, (priv->orientation == GTK_ORIENTATION_VERTICAL ?
priv->trough.height : priv->trough.width) /
(gtk_adjustment_get_upper (priv->adjustment) -
gtk_adjustment_get_lower (priv->adjustment) -
gtk_adjustment_get_page_size (priv->adjustment)));
/* the above is ineffective for scales, so just set a zoom factor */
if (zoom == 1.0)
zoom = 0.25;
}
else
zoom = 1.0;
c = priv->slide_initial_slider_position + zoom * delta;
new_value = coord_to_value (range, c);
next_value = coord_to_value (range, c + 1);